From patchwork Tue Apr 20 10:57:49 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takuya Yoshikawa X-Patchwork-Id: 93649 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o3KAsDjR007363 for ; Tue, 20 Apr 2010 10:54:13 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754484Ab0DTKyK (ORCPT ); Tue, 20 Apr 2010 06:54:10 -0400 Received: from serv2.oss.ntt.co.jp ([222.151.198.100]:46811 "EHLO serv2.oss.ntt.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754341Ab0DTKyJ (ORCPT ); Tue, 20 Apr 2010 06:54:09 -0400 Received: from serv2.oss.ntt.co.jp (localhost [127.0.0.1]) by serv2.oss.ntt.co.jp (Postfix) with ESMTP id 02CFC24820B; Tue, 20 Apr 2010 19:54:07 +0900 (JST) Received: from serv1.oss.ntt.co.jp (serv1.oss.ntt.co.jp [172.19.0.2]) by serv2.oss.ntt.co.jp (Postfix) with ESMTP id E4F7F2481F9; Tue, 20 Apr 2010 19:54:06 +0900 (JST) Received: from yshtky3.kern.oss.ntt.co.jp (unknown [172.17.1.144]) by serv1.oss.ntt.co.jp (Postfix) with SMTP id BFEF511C11D; Tue, 20 Apr 2010 19:54:06 +0900 (JST) Date: Tue, 20 Apr 2010 19:57:49 +0900 From: Takuya Yoshikawa To: avi@redhat.com, mtosatti@redhat.com Cc: kvm@vger.kernel.org, kvm-ia64@vger.kernel.org, kvm-ppc@vger.kernel.org, fernando@oss.ntt.co.jp Subject: [PATCH RFC v2 2/6] KVM: introduce wrapper functions to create and destroy dirty bitmaps Message-Id: <20100420195749.93a90e78.yoshikawa.takuya@oss.ntt.co.jp> In-Reply-To: <20100420195349.dab60b1d.yoshikawa.takuya@oss.ntt.co.jp> References: <20100420195349.dab60b1d.yoshikawa.takuya@oss.ntt.co.jp> X-Mailer: Sylpheed 2.6.0 (GTK+ 2.16.1; i486-pc-linux-gnu) Mime-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Tue, 20 Apr 2010 10:54:13 +0000 (UTC) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index cc78e07..40a6888 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -431,6 +431,12 @@ out_err_nodisable: return ERR_PTR(r); } +static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + vfree(memslot->dirty_bitmap); + memslot->dirty_bitmap = NULL; +} + /* * Free any memory in @free but not in @dont. */ @@ -443,7 +449,7 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free, vfree(free->rmap); if (!dont || free->dirty_bitmap != dont->dirty_bitmap) - vfree(free->dirty_bitmap); + kvm_destroy_dirty_bitmap(free); for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { @@ -454,7 +460,6 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free, } free->npages = 0; - free->dirty_bitmap = NULL; free->rmap = NULL; } @@ -516,6 +521,18 @@ static int kvm_vm_release(struct inode *inode, struct file *filp) return 0; } +static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(memslot); + + memslot->dirty_bitmap = vmalloc(dirty_bytes); + if (!memslot->dirty_bitmap) + return -ENOMEM; + + memset(memslot->dirty_bitmap, 0, dirty_bytes); + return 0; +} + /* * Allocate some memory and give it an address in the guest physical address * space. @@ -649,12 +666,8 @@ skip_lpage: /* Allocate page dirty bitmap if needed */ if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { - unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new); - - new.dirty_bitmap = vmalloc(dirty_bytes); - if (!new.dirty_bitmap) + if (kvm_create_dirty_bitmap(&new) < 0) goto out_free; - memset(new.dirty_bitmap, 0, dirty_bytes); /* destroy any largepage mappings for dirty tracking */ if (old.npages) flush_shadow = 1;